the 21-year-old muslim born american refused fight what he called an unjust war in afghanistan. >> i refuse to go to afghanistan because it was against my islamic conditions. >> reporter: he accused the army trumping up charges he possessed child pornography and three weeks ago awol from ft. campbell, kentucky. on tuesday his anger took a more ominous turn when he went to a gun shop in texas and bought six pounds of gun powder and asked a strange question. >> what is smokeless powder? if you don't know what it is, why would you buy six pounds of it. >> reporter: police arrested abdo at this nearby hotel with gun powder, a pressure cooker, batteries, clocks, semiautomatic handgun and more than 100 rounds of ammunition. sources say abdo has told investigators he wanted to attack soldiers from nearby ft. hood, perhaps by bombing a restaurant outside the base. abdo explained he was, quote, seeking revenge for what the army did to me. abdo's alleged plot comes less than two years after a shooting spree at ft. hood left 13 people dead. the accused gunman nidal hasan who is waiting trial. i